RECON: TNO occultation with 65489

Event between (65489) Ceto and star TYC20350-00237-1 with event index number of 114859

Geocentric closest approach at 2018/04/15 12:51:50 UTC

J2000 position of star is 15:36:42.7 +01:00:20
Equinox of date position of star is 15:37:37.5 +00:56:50
Stellar brightness V=10.0, use SENSEUP=2
Star is 145 degrees from the moon. Moon is 1% illuminated.
TNO apparent brightness V=22.3

TNO is 38.6 AU from the Sun and 37.7 AU from the Earth.
The TNO is moving 22.8 km/sec on the sky relative to the star, or, 3.0 arcsec/hr.
The 1-sigma error in the time of the event is 102 seconds.
The 1-sigma cross-track error in the shadow position is 2026 km.

The TNO has an absolute magnitude Hv=6.4
Diameter=316.2 km assuming a 5% albedo -- 13.9 sec chord
Diameter=129.1 km assuming a 30% albedo -- 5.7 sec chord
Dynamical classification is CENTAURR
 
 
 
 
 
 
 
 

Star training set for 65489, (2018/04/15 12:52UT)
Object            RA         Dec     mag  sep  mel
Arcturus       14:16:29.8 +19:05:17  0.0 26.92 153
Unukalhai      15:45:10.2 +06:22:09  2.6  5.74 142
10 Ser         15:29:33.8 +01:46:47  5.2  2.18 146
PPM 161731     15:36:44.6 +01:10:05  8.2  0.32 145
PPM 161739     15:37:14.3 +01:05:24  9.6  0.18 145
PPM 161750     15:37:38.6 +00:56:46 10.3  0.00 144
65489          15:37:38.6 +00:56:46 10.0       144
Positions are for equinox of date

Azimuth is measured in degrees eastward from north. North is at an azimuth of 0, due East is at an azimuth of 90 degrees, due South is 180, and due West is 270.

Do not use the listing below for the RECON CPC 1100 telescopes. This is provided for other non-team facilities.

Star training set for 65489, (2018/04/15 12:52UT)
Object            RA         Dec     mag  sep  mel
Arcturus       14:15:38.3 +19:10:21  0.0 26.92 153
Unukalhai      15:44:16.3 +06:25:33  2.6  5.74 142
10 Ser         15:28:38.1 +01:50:31  5.2  2.18 146
PPM 161731     15:35:48.8 +01:13:40  8.2  0.32 145
PPM 161739     15:36:18.5 +01:08:58  9.6  0.18 145
PPM 161750     15:36:42.7 +01:00:20 10.3  0.00 144
65489          15:36:42.7 +01:00:20 10.0       144
Positions are for J2000

Event circumstances last updated at 2017/12/02 17:26:26 UT

Marc W. Buie, Southwest Research Institute

RECON